Dell Latitude E6510 unknown device ACPI SMO8800

New Dell Latitude owners may notice an unknown device in their device manager. Here’s how to find out what it is and the solution to what mine was.

In Device Manager, right-click the device and click Properties. Under the details tab, choose Hardware ID from the drop box. You’ll see something like ACPI\SMO8800 (that’s what the unknown device was on mine). Google that hardware ID and you’ll find that it’s an accelerometer, a device that detects when your laptop may be falling and instantly stops the hard disk so it isn’t damaged on impact.

For those with the specific ACPI\SMO8800 device, here’s a link to Dell’s driver for
the freefall sensor.

Additionally, you may find this unknown device identifier utility useful.

About Beecher Bowers

34 comments on “Dell Latitude E6510 unknown device ACPI SMO8800

  1. Kudos for finding this !!! Worked great on my E6510. I actually remembering unsintalling it because I was cleaning this laptop for a new user and didn’t know what it was. Oops !! Thanks again.

  2. Thank you so much for such a smart solution! Nothing helped until I found your post. Great job!

  3. Additionally…i noticed the driver listed is a bit old. You can find the newest version of the free fall sensor driver at Dells website after putting in your service tag and going under the Applications tab. At the very bottom should be the latest version.

  4. Like Tim, I too google searched for the ACPI\SMO8800 and this is the first hit I got. Resolved my issue with my E6410. Thanks!

  5. Thanks so much worked with Latitude 13. Also thanks for the suggested software unknowdevice been looking for something like that.

  6. Worked for Dell Precision M4500. I spent hours scouring the internet and contacting Dell to no avail until I found this. Thank you so much for posting this…

  7. Thank you so much!! This was the only problem I had left ..and it worked great for the XPS 15 I just bought when I upgraded the OS.

  8. Thank you, I had this problem after reinstallin a Dell E6510 with 64bit Win7, it had come with 32bit installed and the instructions and driver setting from Dell didn’t help me with this “Unknown Device”. I did a search on acpi SMO8800 and found your post.


  9. Thanks for this. I did a google search for the ACPI\SMO8800 and this was the first site I found. It helped with the Latitude E6410 I was having problems with. Thanks again.

  10. worked great for studio 17 also its located on the cd. I just needed to know that this was the motion sensor…. gesh the hours I wasted

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